feat: Added temp brand tokens to mobile codebase

[brianacnguyen]

Description

• Added white and black brand color to be used for elements that need absolute white/black color regardless of theme

Related issues

Fixes: N/A

Manual testing steps

1. N/A

Screenshots/Recordings

Before

N/A

After

N/A

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've clearly explained what problem this PR is solving and how it is solved.
• I've linked related issues
• I've included manual testing steps
• I've included screenshots/recordings if applicable
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
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Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

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[georgewrmarshall]

Looking good! Those should align with the design tokens once we move them to the package. Left one comment regarding the square bracket key syntax

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[georgewrmarshall]

LGTM! Nice work 🚀